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Prior to the Human-Covenant War the SPARTAN-IIs were deployed onto the battlefield as shock infantry, Blue Team often exercised versus fellow SPARTAN-II Green Team, led by SPARTAN-051 (Kurt), and often lost[2] because of Kurt's superior "sixth sense." Blue Team was formed around John-117, Kelly-087, and Sam-034, who met on their first day of induction into the SPARTAN-II program.

With minimal attention, Blue Team managed to kill several of Watt's guards and subdue him with polypseudomorphine, a sedative. Then Blue Team hijacked a rebel Pelican Dropship and Sam-034 set and detonated explosive charges in the rebel base's hangar, making good their escape, but at the cost of dozens of civilians' lives. Blue Team was successful in its objective.

By 2531 Blue Team had carved out a reputation for itself amongst Insurrectionist forces, particularly the United Rebel Front. The then four-man team disrupted URF operations including Station Jefferson, the destroyer URF Origami and a saboteur cell on Reach, as well as an incident in Micronesia, and a high-explosives manufacturing facility at an unspecified location.[3] In response the rebels gathered together three FENRIS Nuclear Warheads at Camp New Hope in a way so sloppy that the Office of Naval Intelligence could not help but notice, then contacted the UNSC and offered to trade the nukes in exchange for medicines for their people suffering from Boren's Syndrome. They then set a trap for Blue Team, whom they anticipated would be sent. They successfully ambushed John, Fred, Kelly and Linda using an Antigravity Plate, however were unaware of the presence of Kurt, a new addition to the team, who had avoided the trap. Kurt was able to free the other members of Blue Team and they then retreated from the camp with the recovered warheads. Rebel leader General Howard Graves was killed in the process.

During the Battle of Reach, the SPARTAN-II company was divided into two teams: Red Team and Blue Team. Blue Team was tasked with defending an orbital space station's navigational data that could possibly lead the Covenant to Earth - which would be devastating to the UNSC. Red Team, far larger than Blue Team, was sent to the planet surface of Reach to defend the power generators that powered the Orbital Defense Platforms.

Blue Team consisted of SPARTAN-117 (Blue One), SPARTAN-005 (Blue Two), and SPARTAN-058 (Blue Three). Blue Team departed from the UNSC Pillar of Autumn in a Pelican Dropship and crash-landed on the space station shortly before waves of Jackal Rangers and Elites landed. On maneuvers, Blue Two was shot at with crystalline needler rounds that penetrated the propellant module on the back of his armor that allowed him to maneuver in zero-g. With thruster wash billowing everywhere, Blue Two was blown into space, unable to control his trajectory.

However, Blue One (John) and Blue Three (Linda) were able to infiltrate the locked-down space station, and with the help of Staff SergeantAvery J. Johnson and several other Marines, destroy the navigational data so that the Covenant would be unable to find and destroy Earth. However, during extraction, Blue Three was shot in the back with an overcharged Plasma Pistol, and fell into a deep coma, Blue One (John 117) and the Marinefireteam survived.

John-117 had acquired the index from the Didact during the ambush and followed him to the control room with Carillon, while the rest of the SPARTANs waited in their Longsword. While there, John disabled the ring's safety limits and gave over the index to Carillon. Carillon then preceded to detach that section of the ring, letting it burn up in the planet below. Carillon teleported John-117 to the Longsword and let the Didact burn up. Following their return to Earth, though Admiral Hood asked John-117 and his team to take some shore leave, the Master Chief told them that they're cleared for more missions.[6]